an angle that forms a linear pair with one of the interior angles of the trinagle.(Apex)
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The exterior angle of a triangle is equal to the sum of the two opposite interior angles
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Any triangle with a 90 degree angle is a right triangle.
a triangle w/ an angle perpendicular like this l_
There are several different formulas. The best one to use depends on what information you have about the rest of the triangle.
A triangle is said to be well-conditioned when no angle in it is less than 30 degrees or greater than 120 degrees. An equilateral triangle is considered to be the best-condition or ideal triangle.
the characteristeristics that describes a right isosceles traingle is all sides are equal twosidesmeet at a 90 angle